Extensible ski pole



Dec. 12, 1950 H. A. JENSEN ExTENsIBLE sx1 POLE Filed Jan. 1e, 194e7l/ez? 0r //YS AUG U57' JENSEN or'neys Patented Dec. 12, 1.950

UNITED STATES nxrsnsmnn snr POLE Hans August Jensen, Lommedalen, nearOslo, Norway Application January 18, 1946 SerialNo. 641,909 In NorwayDecember 22,1943

(Cl. 28B-#11317) 2' Claims. l

The present invention relates toan extensible skipole of the kind whichconsists of two members, which telescope in each other, andv which aremutually lockj` by an outwardly', directed radial. pressure.y Theinvention has for its object to provide a pole of this kind, which is ofa simple construction and at the same time provides aI secure lockingeffect between the two pole members.

Ski-poles of this kind are known. The known constructions however, areeither' too'v complicated and therefore too expensive or do not provideal secure mutual connection of the pole members in. thel lockedposition. Thus it has been previously proposed to provide the lockingconnection between the pole or tube members by means of resilienttongues or projecting pins engaging in grooves.. According to anotherproposal the upper part of! the pole has been made with a double wall',the lowerpol'e' member being introduced into the space between the twovwalls of the" upper pole member. The locking effect is here produced inthat way that a screw-threaded metal cone is pressed against the innertube wall of the upper pole member and thereby forces this tube memberinto engagement with the outer tube walls. In order to increase theexpanding effeet, the lower end of the inner tube is made conical orprovided with a conical mouthpiece opening welded thereto.

Common to all previously known proposals is that the locking eiectbetween the two pole or tube members is produced by the mutual pressingor expanding effect of these tube members.

The present invention relates to ski-poles of the kind which consist oftwo parts, which telescope into each other and may be mutually locked byan outward radial pressure produced through the expansion-pressure ofthe locking A member against the one pole-part and the invention ischaracterized by the fact that the expansion-eiect is caused or releasedby the rotation of the pole-members, whereby the locking member isarranged and dimensioned in such a manner, that it also in releasedposition will be in frictional engagement with the inside of the onepole-part.

Thus, the locked connection of the pole members is produced by theincreased resilient pressing of the expansible locking member againstthe inside of one pole member, and not by a mutual pressing of the polemembers against each other. In this manner an advantage is obtained inthat deformations of the pole members in consequence PATENT OFFICE- oflong use does not prevent or hamper the locking' action..

According. to the invention the locking member consists of a slotted,approximately cylindrical member pointed at the one end and having acentral. screw threaded bore, which bore expands conically' at the oneend. According to a further feature of the invention this locking memberis provided on a screw threaded-spindle which is fixed in the polemember, and which spindleA has above the threaded portion a conicalexpansion corresponding to the conical expansion of the central. bore ofthe locking member.

These and other features of' thev invention will appear from thefollowing. description in connection with the annexed drawings, in whichFig. 1 shows the upper 'part of the pole4 in lon gitudinal section, Fig.2 theA locking member seen from the side, Fig. 3 the same seen fromabove, and Fig. 4 is a sectional view similar to Fig; l of a modiedstructure' in which a spindle is placed in the upper tube member.

In the drawings, I designates the lower tubular pole member and 2 theupper one, which two members telescope in each other. The upper member 2is closed by a plate and in the upper end of the lower member i a plate3 is also iiXed by welding or the like and which provides a seat for aspindle e. In this plate 3 the spindle 4 is rigidly arranged, and theend 6 of this spindle is screw-threaded and connected with theunthreaded portion of the spindle by a conically expanding portion 5. Onthe threaded portion of the spindle there is arranged an approximatelycylindrical member i, one end 8 of which is pointed or otherwise reducedin diameter in order that it may easily be introduced into the uppermember 2. The diameter of the locking member is such that it may just bepushed into upper member 2.

rlhe locking member 1 has a central screwthreaded bore It correspondingto the screwthread of the spindle, and in one end-in the drawing thelower end-this bore i@ is enlarged conically in a manner similar to theconical portion 5 of the spindle. Further, the locking member 'i isslotted at 9 as shown in Figs. 2 and 3. When the locking member has beenscrewed onto the spindle, it may be secured against screwing off fromthe same by a stop nut `shown by I2 in Fig. 1.

The device operates as follows: Y

Assume the locking member is screwed onto the threaded point of thespindle li. By screwing the spindle further into the bore of the member1 so that the conically expanding portion of the spindle is pressedagainst the conically expanding portion II of the bore of the lockingmember, this locking member because of the slottings will be expandedand pressed against the inner side of the tube wall of the member 2 andthereby lock the other members together. By rotation in the oppositedirection the arrangement will be released, the locking member yieldingresiliently as soon as the interior expanding action ceases. The tubemembers may then be displaced and locked together again with the desiredlongitudinal axial adjustment.

It is clear that it is not essential to provide the spindle in the lowertube portion. it may for example also be placed in the upper tube memberfor instance by being xed in the plate fastened to the top of this polemember. However, by flxing the spindle in this pole member the spindlewill be considerably longer. As shown in Fig. 4, a spindle I4 issupported from a dome end I3 of the upper tube 2. The spindle I4projects into the lower tube I and has a conically expanding portion I5and a screw-threaded end I6. An approximately cylindrical member I1 isthreaded on the threaded portion I6; one end I8 of this cylindricalmember I'I is reduced in diameter. The locking member I1 has a centralscrew-threaded bore 20 corresponding to the screw-thread of the spindleI 4. This bore 20 is enlarged conically at 2| to receive the conicallyexpanding portion I5 of the spindle I4. A stop nut 22 prevents thelocking member I'I from being screwed off the spindle I4. The operationof the modification shown in Fig. 4 is the same as described inconnection with the previous figures except that the locking member willbe pressed against the inner side of the inner, lower tube member andnot against the outer, upper l pole member as shown in the drawings.

The pole is as usual provided with handle and stop.

What I claim is:

l. An extensible ski pole comprising two relatively telescopinghollowparts, one of said parts being provided with a reduced externallythreaded terminal portion and external conical wall faces, a cylindricallocking member disposable within the other of said telescoping parts,the said locking member having slots extending over part of its lengthand having an internal axial bore and a reduced neck, the said neckbeing internally threaded and the said bore including conical wall facesfor co-action with said external wall faces whereby the said reducedterminal portion is adapted to nest within the said bore and, uponrotation, to eiect spreading of the locking member and thus interlockingof the two telescoping parts.

2. A ski pole constructed in accordance with claim 1 wherein the saidreduced terminal portion is of a length to extend beyond said bore andwherein an abutment is detachably secured to the protruding part of saidterminal portion t0 prevent disengagement between the locking member andthe said threaded teninal portion.

HANS AUGUST JENSEN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 653,642 Darling July 10, 19001,569,765 Lowell Jan. 12, 1926 2,367,196 Butler Jan. 16, 1945 FOREIGNPATENTS Number Country Date 75,186 Norway June 27, 1949 718,486 FranceNov. 4, 1931

